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PROTECTING AGAINST COUNTERFEIT ELECTRONICS DEVICES

  • US 20080267408A1
  • Filed: 04/24/2007
  • Published: 10/30/2008
  • Est. Priority Date: 04/24/2007
  • Status: Active Grant
First Claim
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1. In a first device connected with a second device, a method of authenticating the first device, the method comprising:

  • receiving a first cryptographic key at the first device, wherein the second device has a complementary second cryptographic key;

    receiving a data string in a first predetermined memory location, wherein the data string is a random or pseudo-random data string and wherein the data string has a first cryptographic state;

    changing the first cryptographic state of the data string to a second cryptographic state with the first cryptographic key; and

    writing the data string having the second cryptographic state to a second predetermined memory location.

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